Stone-polishing wheel



H. W. WHITGOMB. STONE POLISHING WHEEL.

(No Model.)

No. 441,524. Patented Nov. 25, 1890.

IN VENTOH @7737 W mizomz.

I WITNESSES: d2 I i A TTOH/VE rs UNITED STATEs PATENT OFFICE.

HARRY \V.- VHITCOMB, OF BARRE, VERMONT.

STONE-POLISHING WHEEL.

SPECIFICATION forming part of Letters Patent No. 441,524, dated November25, 1890.

' Application tiled March 26, 1890- Serial No. 345,336. (No model.)

-Wheels, of which the following is a specification.

My invention is in the nature of an improved polishing-wheel for thepurpose of reducing the rough face .of a slab or block of stone, slate,or similar material to a smooth surface.

It consists in the peculiar construction of a metal disk or frame-platewith detachable scroll-shaped flanges securedthereto by screws or boltsand having connections for a vertical pendent shaft, whereby the wheelis rotated in a horizontal plane on the upper face of the stone to bedressed, acting thereupon through the agency of sand or small pellets ofhard cast-iron, as hereinafter fully described.

Figure 1 is an inverted plan or underneath view of the polishing-wheel.Fig. 2 is an edge View of the same shown applied to a stone which isbeing polished. Fig. 3 is a crosssectional view through the line x as ofFigs. 1 and 2.

In the drawings, B representsthe frameplate of the wheel, which is ofcast-iron, and is formed with lugs Z l upon its upper side, whichconstitute a socket or seat,within which is bolted the lower end of thependent driving-shaft by which the wheel is rotated. To the lower sideof this plate there are detachably fastened volute-shaped flanges orspiral scrolls O C-two in numbersymn1etrically arranged upon oppositesides of the center and curving toward the center. These scrolls orvolute spiral flanges are secured to the frame-plate detachably byscrews or bolts to.

These spiral flanges are made of wroughtiron 01' steel for a specialreason hereinafter described, and their outer ends are made runnershape, as shown in Fig. 2, and these front or leading ends of theflanges are beveled upon one or both sides to a knife-edge, as shown inFig. 3, the object of which will be explained hereinafter.

In making use of this invention there is applied to the surface of thestone to be polished a quantity of sand or fine hard pellets ofcast-iron, (shown at E,) through the agency of which the flanges of thewheel are made to act upon the stone to scour and dress off theirregular surfaces of the stone.

The polishing-wheel revolves in the direction of the arrow in Fig. 1,with the outer points'A of the flanges in the lead, and here may beunderstood the function of the sharp runner-shaped ends A, for thesepermit the flanges to quietly enter or cut down into the sand withoutflirting or throwing off and wasting the sand from centrifugal action.As the wheel revolves the curve of the flange draws toward the center,and this causes the sand also to be drawn toward the center. in a degreesufficient to prevent the sand from being thrown out from under thewheel from centrifugal action, thus avoiding the wasting of sand.

The object in making the flanges O detachable is to permit them whenworn down to be removed and new ones supplied, which may be fastened tothe frame-plate without the necessity of supplying an entire new wheel.It is also to permit the flanges to be made of soft wrought metal, for Ihave found that the flanges when made of soft metal wear longer thanwhen made of hard cast-iron. The rea son for this is as follows: Thesoft metal allows the grains of sand to become embedded or encysted inthe soft metal and move with it, scouring over the harder surface ofstone, so as to wear away the latter, instead of the face of theworking-wheel. Another important result is that when the flanges aremade of wrought-iron or steel there is a longitudinal grain in theflanges that prevents the grains of sand from moving crosswise theflanges and holds them to the stone without allowing them to move outfrom centrifugal action, to the detriment of the flanges. hen theseflanges are made of tough wrought-iron or steel, I find that they lastas long as six cast-iron wheels and do also very much more effectivework, for the reason that the wear is almost entirely limited to thestone,instead of being borne equally upon the stone and wheel; and,furthermore, by making the flanges detachable they can be readily forgedout of wroughtiron or steel and applied to ICO the cast-iron frame-plateby screws, thus saw wrought or soft metal, having sharpened runing greatexpense to the user, as Well as male ner-shaped outer ends,substantially as shown I0 ing a much more effective wheel. anddescribed.

Having thus described my invention, what r ,T ,7 7 n I claim as new YIIARRX ll Vi 1H1 COMB.

A polishing-wheel for stone, consisting of a 'itnesses: metal diskorframe-plate made of cast metal, L. \V. VHITCOMB, combined withdetachable spiral flanges C, of B. J. MORSE.

